inspect a service on the swarm

当你在一个swarm 中部署了一个服务，你可以通过以下的命令行语句来查看集群中运行的服务的详细信息
docker service inspect --pretty <SERVICE-ID>

$docker machine ssh manager1

查看helloworld 服务的详细信息
$ docker service inspect --pretty helloworld
ID:9uk4639qpg7npwf3fn2aasksr
Name:helloworld
Service Mode:REPLICATED
Replicas:1
Placement:
UpdateConfig:
Parallelism:1
ContainerSpec:
Image:alpine
Args:ping docker.com
Resources:
Endpoint Mode:  vip

如果需要返回的信息是json格式，只需要不带 --pretty 参数即可

$ docker service inspect helloworld
[
{
"ID": "9uk4639qpg7npwf3fn2aasksr",
"Version": {
"Index": 418
},
"CreatedAt": "2016-06-16T21:57:11.622222327Z",
"UpdatedAt": "2016-06-16T21:57:11.622222327Z",
"Spec": {
"Name": "helloworld",
"TaskTemplate": {
"ContainerSpec": {
"Image": "alpine",
"Args": [
"ping",
"docker.com"
]
},

"Resources": {
"Limits": {},
"Reservations": {}

},
"RestartPolicy": {
"Condition": "any",
"MaxAttempts": 0
},
"Placement": {}
},
"Mode": {
"Replicated": {
"Replicas": 1
}
},
"UpdateConfig": {
"Parallelism": 1
},
"EndpointSpec": {

"Mode": "vip"
}
},
"Endpoint": {
"Spec": {}
}
}
]

查看哪个节点运行helloworld服务

docker service ps <SERVICE-ID>

$ docker service ps helloworld
NAME                                    IMAGE   NODE     DESIRED STATE  LAST STATE
helloworld.1.8p1vev3fq5zm0mi8g0as41w35  alpine  worker2  Running        Running 3 minutes

在这个例子中，helloworld 其中的一个实例是运行在worker2中。你可能会看到服务运行在manager节点中。默认情况下，manager节点也可以像worker节点一样运行任务。

运行 docker ps 可以查看任务在哪里运行，以及容器运行的详细信息。

$docker ps
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
e609dde94e47        alpine:latest       "ping docker.com"   3 minutes ago       Up 3 minutes                            helloworld.1.8p1vev3fq5zm0mi8g0as41w35